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11.2. Transaction Concepts
11.2.1. About Transactions
A transaction consists of two or more actions which must either all succeed or all fail. A successful outcome is a commit, and a failed outcome is a roll-back. In a roll-back, each member's state is reverted to its state before the transaction attempted to commit.
The typical standard for a well-designed transaction is that it is Atomic, Consistent, Isolated, and Durable (ACID).